<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>选择器练习</title>
    <script src="main/resource/js/jquery-1.8.3.min.js"></script>
    <script src="main/resource/js/classjq.js"></script>
    <link type="text/css" rel="stylesheet" href="main/resource/css/classcss.css"/>
</head>
<body>

    <input type="button" id="btn1" value="点我">
    <div id="div">元素一</div>
    <div>元素二</div>
    <div>元素三</div>

</body>
</html>